Auto Shut Off and Phone Notification When Print Is Done! (wemos,blynk)




So this is a simple project that turns off the 3d printer when its done printing and sents you a notification on your phone. I am jusing the wemos board and the Blynk app. It is probably not the best way but it works for me :D

It works like this:

-when the printer is done printing it goes home to the limit switches,so i added another switch beside the Y-axis.

-when the switch is pressed the Blynk app turns off the relay and sents a phone notofication.

Oh and sorry for the bad english i will give my best :)


Step 1: The Schematics

Here is the schematics for this project. The switch is there because you need to turn the button off when your homing the 3d printer, you turn it back on when the printer starts printing.

For the resistor i am using a 220 Ω.

And for the simplicity of the schematics i am using a LED instet of the relay :)

Step 2: Code

On how to program the Wemos board go here:

Step 3: Blynk App Configuration

In the blynk app you are gona need to add 4 elements:

-Value Display (Select input V1)


-Button (Output D4)

-Eventor settings

-When V1 is higher that 0 turn on D4

-When V1 is lower that 0 turn on D4

- When V1 is higher than 0 send notification: "Your massage"

Step 4: Mounting the Button

This last step is on you. There are so many different printers out there so i cant help you with this :D

Just try to mount the button to the printer somehow. I used some thin wood strips and hot glue.

Step 5: My First Instructable!

This is my first instructable so please give your opinion in the comment and try to be gentle :D



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    4 Discussions


    2 years ago

    I like this. What printer are you using?

    1 reply

    Reply 2 years ago

    I am using a Prusa i3 clone (Pro B). It is a cheap printer but works very well.

    i got it for 160 €


    This could be really useful in a shared lab where a lot of people are trying to use the same printer.

    1 reply
    izidDIY Hacks and How Tos

    Reply 2 years ago

    You are right, never thought of that. I just use it because i have my printer in the basement and i never knew when the print was done.